Re: 4MB extent VG limitations...

This also depends on the LVM version, version 1.0 or 2.x ...

Hope this helps!RegardsTorsten.

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Re: 4MB extent VG limitations...

Dave,

On an existing VG that I have in a system, it appears that I can increase the file system to 7TB but that will require renumbering the PE which may not be recommended by HP. However, this is an existing VG but in your case, you'll be creating a new one. Just wanted to share to give you an idea.

Re: 4MB extent VG limitations...

Install the latest LVM command and kernel cumulative patches on HP-UX 11.23, which will up the max size of a volumegroup/logical volume to 16TB.

Patch Name: PHKL_40918

Patch Description: s700_800 11.23 LVM Cumulative Patch

[..]

No (superseded patches contained enhancements)

PHKL_36745:

This patch provides the kernel component forthe LVM Striped/Mirror and 16TB logical volume features. The Striped/Mirror LV feature allows the creation and use of logical volumes that are simultaneously striped and mirrored.

The 16TB LV feature allows accessing datapast the 2TB offset in logical volumes(formerly logical volumes larger than 2TB could be created but could not be accessed beyond the 2TB boundary). To use these features, they must be explicitly enabled by installing PHCO_36746 or a superseding patch, because using them results in volume groups that are incompatible with prior releases and systems without these features. See theOther Dependencies section of this document for the details.

Re: 4MB extent VG limitations...

THAT WAS IT! What made you think to check the software portion of the HP website? I've been digging through the patch database on the HP website, and found some rather confusing patches related to LVM (more to do with clustering and striping etc.) - never thinking it would be under software -

Re: 4MB extent VG limitations...

Hi Dave,

Dave

>I see talk of a 2TB limit in HPUX - is this the case?> So it seems I have 1.0.0 which doesn't seem like it supports VG's above 2TB.

I beleive you have got the entities of LVM confused or it should be a typo error. Apparently, there is a 2TB limit but that is for a PV and not_a_VG. So that would make it possible to have VGs upto 510TB on LVM v1 . Max PVs of 255 are possible making that 255*2TB=510TB. Well if a VG size limit were to be limited to 2TB, then why not use a whole disk approach!. :)

Or are you for some reason not considering the feature of disk spanning at partition level which would limit the size of that pool of space to let's say 2Tb where you have one P.V in that V.G...

RegardsIsmail Azad

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